| 摘要 |
<p>According to the present invention, an injection nozzle portion of the fuel injection valve is set to have a relation of 2 < DS/DH < 4, h < 1.5d, H < 3d, where DH is a pitch between orifices at the inlet surface (52a) of the orifice plate (52) in respect to an orifice diameter d of the orifice plate (52) in a fluid injection nozzle, DS is a seat diameter, H is a distance between the valve seat (251) and the orifice plate inlet surface (52a), h is a vertical line distance ranging from a needle flat surface to the orifice plate inlet surface (52a) when the abutting portion (263) of the needle (25) is moved away from the valve seat (251). In this way, a flow directed uniformly toward the orifice (52) is induced in a flat flow passage between the needle flat surface (82) and the orifice plate inlet surface (52a), and the fuel flows collide with each other just above the orifice inlet and then the fuel is injected from the orifice (52). Accordingly, the internal energy of the fuel can be effectively taken out in a form of disturbance of collision, the fuel can be effectively changed into fine particles, and at the same time the fuel atomization having a superior directional characteristic can be obtained. <IMAGE></p> |
